- A
The CoPP policy is policing traffic to 1 Mbps, and all traffic so far has been within the limit and transmitted.
The conformed counter matches the total packets, and exceeded/violated counters are zero, meaning no drops.
- B
The CoPP policy is dropping all traffic because the CIR is too low.
Why wrong: No packets have been dropped; the drop rate is 0 bps.
- C
The CoPP policy is not matching any traffic because the class-default does not match any packets.
Why wrong: The class-default matches all traffic by default; the packet count shows it has matched 140225 packets.
- D
The CoPP policy is only policing traffic that exceeds the CIR, but all traffic is being transmitted.
Why wrong: The policer applies to all traffic; conformed traffic is transmitted, exceeded/violated traffic is dropped. Since all traffic conformed, no drops occurred.
Quick Answer
The answer is that all traffic has been within the policed rate and transmitted, as shown by zero exceeded or violated packets. This is correct because the CoPP police counters interpretation hinges on the relationship between the committed information rate (CIR) of 1 Mbps and the actual offered rate; here, all 140,225 packets fell under the conformed bucket, meaning the traffic never exceeded the token bucket depth (bc 31250 bytes), so the transmit action was applied to every packet. On the Cisco CCNP ENARSI 300-410 exam, this output tests your ability to distinguish between conformed and exceeded packets in a control-plane policer—a common trap is assuming that zero exceeded packets means the policy is misconfigured, when in fact it indicates healthy operation. Remember the memory tip: “Conformed = CIR respected; Exceeded = EIR exceeded; if both are zero, the policy isn’t seeing traffic.”
300-410 Device Access Control Practice Question
This 300-410 practice question tests your understanding of device access control. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A network engineer runs the following command to troubleshoot a Device Access Control issue:
R1# show policy-map control-plane input class class-default
Class-map: class-default (match-any) 140225 packets, 12345678 bytes 5 minute offered rate 1000 bps, drop rate 0 bps Match: any police: cir 1000000 bps, bc 31250 bytes conformed 140225 packets, 12345678 bytes; actions: transmit exceeded 0 packets, 0 bytes; actions: drop violated 0 packets, 0 bytes; actions: drop
What does this output indicate?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The CoPP policy is policing traffic to 1 Mbps, and all traffic so far has been within the limit and transmitted.
The output shows that the class-default class in the CoPP policy has a police configuration with a CIR of 1,000,000 bps (1 Mbps). All 140,225 packets have been counted as conforming, with zero exceeded or violated packets, and the conform action is 'transmit'. This means all traffic has been within the policed rate and has been forwarded without drops.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The CoPP policy is policing traffic to 1 Mbps, and all traffic so far has been within the limit and transmitted.
Why this is correct
The conformed counter matches the total packets, and exceeded/violated counters are zero, meaning no drops.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The CoPP policy is dropping all traffic because the CIR is too low.
Why it's wrong here
No packets have been dropped; the drop rate is 0 bps.
- ✗
The CoPP policy is not matching any traffic because the class-default does not match any packets.
Why it's wrong here
The class-default matches all traffic by default; the packet count shows it has matched 140225 packets.
- ✗
The CoPP policy is only policing traffic that exceeds the CIR, but all traffic is being transmitted.
Why it's wrong here
The policer applies to all traffic; conformed traffic is transmitted, exceeded/violated traffic is dropped. Since all traffic conformed, no drops occurred.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the interpretation of police counters in CoPP output, where candidates mistakenly think that a police configuration always drops traffic or that class-default does not match traffic, when in fact the counters clearly show conformed packets and zero drops.
Trap categories for this question
Command / output trap
The class-default matches all traffic by default; the packet count shows it has matched 140225 packets.
Detailed technical explanation
How to think about this question
The 'police' command in a CoPP policy uses a token bucket algorithm with a committed information rate (CIR) and burst size (bc). The 'conformed' counter increments when packets arrive within the token bucket depth, and the 'exceeded' and 'violated' counters increment when the bucket is empty or when a second token bucket (be) is exceeded. In this output, the absence of exceeded/violated packets indicates the offered rate of 1000 bps is well below the CIR of 1 Mbps, so all packets are immediately transmitted.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this 300-410 question test?
Device Access Control — This question tests Device Access Control — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The CoPP policy is policing traffic to 1 Mbps, and all traffic so far has been within the limit and transmitted. — The output shows that the class-default class in the CoPP policy has a police configuration with a CIR of 1,000,000 bps (1 Mbps). All 140,225 packets have been counted as conforming, with zero exceeded or violated packets, and the conform action is 'transmit'. This means all traffic has been within the policed rate and has been forwarded without drops.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 24, 2026
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